Lining for hot-gas-carrying conduits



Oct. v29, 1929. M. E. cusHlNG LINING FOR HOT GAS CARRYING C'ONDUITS Filed June 18, 1928 2 Sheets-Sheet 1 Inventor 71g ME.' @a5/1 By be-IMAM/uJAttomey Oct. 29, 1929. M. E. cUsHlNG LINING FOR HOT GAS CARRYING CONDUITS 2 Sheets-Sheet 2 Filed June 18 1928 30 is concerned, have heretofore been recognized,

Patented Oct. 29, 1929 MICHAEL n comme, or mm cmfY, man

LINING FOB HOT-GAS-CABBYING NIDUII1S` Application med .Tune 18,

My invention relates to a lining for hot gas-carrying conduits such as the downcomers '6 a lining which shall be enduring, relatively ing conduits which shall light in construction, and not subject to serious abrasion from dust laden hot gases.

A further object of my invention is to provide a novel metallic linin for hot gas-carry- Iie of light weight, together with novel means for insulating the lining from the outer jacket of the conduit.

A still further object of my invention is to provide, in a metallic lining for hot gas-carrying conduits, a special, hollow metallic refractory block which may be readily and easily insulated from the outside of the conuit.

I-Ieretofore the lining for downcomers, dust catchers, gas mains and gas washers associated with blast furnaces, and conveying the hot gases, have been constructed of refractory non-metallic brick. Such linings are subject v to serious abrasion and often have to be replaced due to the cutting out of the brick. The replacing of a lining in such a conduit necessitates a shutting down of a furnace which, as is well understood, is very expensive. While the advantages of a metallic lining, in so far as its freedom from abrasion it has not been heretofore adopted for general use, due to its relatively great weight, to its expense, and to the fact that it radiates heat more freely than does a non-metallic refractory lining.

I have found that the above objection may be overcome by providing a relativel thin metallic inner lining with a non-meta lic refractory backing which serves to reduce the weight and radiation of heatwhilethe metallic inner lining resists the abrasive action of the dust laden gases. In carrying out my invention, the entire lining of the conduit may be faced with my improved metallic members or only such part as are subjected to the most severe cutting action of the gases may be lined.

In one form, my invention comprises metallic plates cast to form overlapping joints 1928. Serial lo. 886,311.

at the sides and ends to present a smooth inner surface to the conduit and having integrally cast lugs on the backs of the members cored out to accommodate bolts for securing the plate to the outer jacket of the conduit. In a preferred form of my invention, the metallic members are formed in the shape of hollow bricks or blocks which are closed on all sides except one and which are filled with a non-metallic refractory substance which acts as insulation. The metallic refractory bricks or blocks are laid up with refractory mortar the same as non-refractory bricks and are made in such shapes that they may be` laid up in the form of an arch or circle or a straight wall in order to accommodate the shape of the conduit and present a smooth inner metallic surface for the conduit.

Apparatus embodying features of my inventlon is illustrated in the accom anying drawings, forming a part of this app ication, wherein Fig. 1 is a sectional view of a hot blast main having my improved lining a plied thereto around a part of its inner sur ace where the cutting action of the blast is the greatest;

Figs. 2 to 7, inclusive, are views 1n front and end elevation, alternately, showing the different shapes in which my improved metallic refractory blocks are made;

Fig. 8 shows a modified form of my invention for use with conduits carrying relatively llpwerl temperature gases than shown in Fig. 9 is a plan view of an individual block such as is shown in Fi 8 Fig. 10 is a sectionaI line X--X of Fig. 9, and

Fig. 11 is a view in side elevation of one of the blocks.

Referring to the drawings, I show in Fig. 1 a hot blast main 10 at a point near a hot blast valve chamber 11 having a valve 12 disposed therein. As is well understood, the blast in such a situation exerts its greatest cutting effect around the arch 13 of the main. In the example shown, I provide a metallic lining around the arch 13`and provide the sides of the main with a non-metallic refractory lining 14.

vidw taken along the Y The metallic refracto lining is comprised conduits com risin hollow refractory metalof hollow blocks 16 laildyup with refractory lic blocks lil ed wi refractory mortar. mortar 17in the way of ordina non-metallic 2. An inner lining for hot as carrying refractory bricks. The bloc s 16 shown conduits comprising hollow refractory mein detail in Figs. 2 and 3 are of a shapiartallic blocks filled with refractory mortar, 70 ticularly adapted for a circular su ace. and laid up with refractory mortar between Each of the blocks is hollowed out at 20 and the blocks. open entirely on the back side so as to form 3. An inner lining forl hot as-carrying arelatively thin wall hollow block. The inconduits comprising hollow refgractory meterior of this block is filled with a suitable tallic blocks filled with refractory mortar, 75 non-metallic refractory 18 winch may be any laid up with refractory mortar between the one of desirable kinds of refractor cement, bloc s, and a non-metallic refractory backand which acts as insulation for t e linin ing for the metallic blocks,

Backlng up the b lock 16 1 S a non-metalllc 4. A lining for hot gas-carrying conduits refractory interllnlng 19 Whlch serve S 8,S furcomprising hollow metallic refractory blocks, 50 .l1e 1 1119113131011. betwell the metalllC 1111101' each 0f the blocks being Open along one side lining and the outer Jacket 2l of the blast thereof and closed on all other sides, a fillmaln. ing of refractory mortar within the hollow The hollow blocks formy 1mprovedl1n1ng of the block, and a non-metallic refractory 2o may be made 111 any deslrable Shapes to C911- backing for the b1ocks,the dosed sides of the 85 form t0 the Shape 0f the COIldUlt 111 Whlh blocks being disposed toward the inner side they are to be used. For example, I show 1n of the conduit Flgs- 4 md 5a a Core@ block 26 which 1S Wedge In testimony whereof I aiiix my signature. shaped 1n cross sectlon through its narrower MICHAEL E CUSHING.

dimension for laying up the sides of an arch., 90

` In Figs. 6 and 7 I show hollow blocks 27 which are wedge shaped in cross section along their longer dimension and which are suitable for arch wedges. The blocks 26 are open 30 along their longer, wider side while the blocks e5 27 are open at their wider ends.

Referring now to Figs. 8 to 11, I show a modified form of my invention adapted for use in conduits which convey, gases of lower temperatures than those shown in the previ- 100 ous gures of the drawing. The lining shown in Figs. 8 to 11 comprises arcuate shaped blocks 31 having cored lugs 32 cast integrally therewith 'for the reception of 40 bolts 33 which secure the-plates 31 to the 105 i outer jacket 34. The inner faces of the blocks 31 are cast with recesses 36 to receive the heads of the' bolts 33. The opposite sides of each of the blocks 31 are undercut as at 37 and 38 to provide-shipla ljoints with adja- 110 cent blocks and areprovi ed with oppositely beveled ends 41 and 42 to provide beveled joints with adjacent end members.

When assembled in the manner shown in 5. Fig. 8, the. space between the jacket 34 and 115 1 Ithe plates 31 is filled with a suitable nonmetallic refractory insulation 43 which prevents undue radiation` of heat from the main. While I have shown my invention in several forms, it will be obvious to those skilled in the art that it is not so limited but is susceptible of various other changes and modications, without departing from the spirit thereof, and I desire therefore, that only such 195 limitations shall be placed .thereupon as are imposed by the prior art, or as are specilicalvlyhset forth in the appended claims.

at I claim is: 1. An inner lining for hot gas-carrying 130 

